            &        reg1   &        reg2   &        reg3   \\
            &        b/se   &        b/se   &        b/se   \\
2.treat     &      -0.224   &      -0.224   &      -0.224   \\
            &     (0.158)   &     (0.158)   &     (0.159)   \\
3.treat     &      -0.042   &      -0.042   &      -0.042   \\
            &     (0.207)   &     (0.207)   &     (0.208)   \\
4.treat     &      -0.021   &      -0.020   &      -0.023   \\
            &     (0.221)   &     (0.222)   &     (0.223)   \\
_cons       &       5.064***&       5.595***&       5.080***\\
            &     (0.389)   &     (0.115)   &     (0.077)   \\
